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Summarized Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Summarized Quarterly Financial Data [Abstract]

Schedule Of Quarterly Financial Information

		Quarter
2011		First				Second				Third				Fourth
Revenues		$	171,956			$	163,789			$	135,865			$	155,824
Income from operations			59,225				50,145				24,405				45,369
Net income			35,791				29,647				13,935				26,671
Net income per share:
Basic		$	2.81			$	2.54			$	1.20			$	2.31
Diluted		$	2.80			$	2.53			$	1.20			$	2.30

		Quarter
2010		First				Second				Third				Fourth
Revenues		$	157,901			$	159,283			$	147,597			$	171,951
Income from operations			59,926				58,691				38,249				58,905
Net income			36,379				35,657				23,341				35,883
Net income per share:
Basic		$	2.68			$	2.63			$	1.73			$	2.74
Diluted		$	2.65			$	2.60			$	1.72			$	2.73

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- Definition

Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 270

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph (a)-(j)

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306

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